CheckCIF报告卡住不动案例(孪晶+溶剂遮掩) 最近,上海某高校小伙伴发来如图1所示求助问题。 ▲图1 问题描述 对方将CIF[1]文件发来后,笔者在checkCIF网站(http://checkcif.iucr.org/)上传其CIF文件,发现的确如此,卡住不动,如图2所示。 ▲图2 执行checkCIF时卡住界面 用Olex2[2]打开该CIF文件并提取hkl和res文件,发现该数据做了孪晶拆分处理,并且使用Olex2例程Solvent Mask[3]进行了溶剂遮掩处理,然而其LIST指令参数确实4,如图3所示。 ▲图3 数据情况 对于孪晶数据,如需进行溶解遮掩,PLATON[4]程序中的溶剂遮掩例程PLATON SQUEEZE[5]告诉我们需要的数据组合形式为:SHELXL[6]程序(或布鲁克的XL)生成的CIF以及LIST 8生成的FCF文件(结构因子(structure factor)文件)——即需要将ins文件中的LIST指令(参阅推文“SHELXL指令之LIST”)的参数改为8。(参阅推文“晶体日记(十八)-从孪晶的squeeze能学到什么”。) 于是对于上述小伙伴的数据,将ins中的LIST 4改为LIST 8,然后精修生成新的CIF文件和FCF文件,再去进行checkCIF验证,发现可以正常得到完整的验证报告。 参考文献 [1] (a) Hall, S. R.; Allen, F. H. Brown, I. D.The Crystallographic Information File (CIF): a New Standard Archive File forCrystallography. Acta Cryst. 1991, A47, 655–685. DOI:10.1107/S010876739101067X. (b) Hall, S. R. The STAR File: A New Formatfor Electronic Data Transfer and Archiving. J.Chem. Inf. Comput. Sci. 1991, 31, 326–333. DOI:10.1021/ci00002a020. (c) Hall, S. R.; Spadaccini, N. The STAR File:Detailed Specifications. J. Chem. Inf.Comput. Sci. 1994, 34, 505–508. DOI:10.1021/ci00019a005. [2] Dolomanov, O. V.; Bourhis, L. J.; Gildea, R.J.; Howard, J. A. K.; Puschmann, H. OLEX2:A Complete Structure Solution, Refinement and Analysis Program. J. Appl. Cryst.2009, 42, 339–341. DOI: 10.1107/S0021889808042726. [3] Spek, A. L.; van der Sluis, P. BYPASS: anEffective Method for the Refinement of Crystal Structures Containing DisorderedSolvent Regions. Acta Cryst. 1990, A46, 194–201. DOI: 10.1107/S0108767389011189. [4] (a) Spek, A. L. Single-Crystal Structure Validation with theProgram PLATON. J. Appl. Cryst. 2003, 36, 7–13. DOI: 10.1107/S0021889802022112. (b) Spek, A. L. StructureValidation in Chemical Crystallography. ActaCryst. 2009, D65, 148–155. DOI: 10.1107/S090744490804362X. (c) Spek, A. L. What Makes aCrystal Structure Report Valid? Inorg.Chim. Acta 2018, 470, 232–237. DOI:10.1016/j.ica.2017.04.036. (d) Spek, A. L. checkCIFValidation ALERTS: What They Mean and How to Respond. Acta Cryst. 2020, E76, 1–11. DOI: 10.1107/S2056989019016244. [5] Spek, A. L. PLATON SQUEEZE: A Tool for the Calculation of the DisorderedSolvent Contribution to the Calculated Structure Factors. Acta Cryst. 2015, C71, 9–18. DOI: 10.1107/S2053229614024929. [6] (a) Sheldrick, G. M. SHELXL-2019/3,Program for Crystal Structure Refinement,University of Göttingen, Germany, 2019. (b) Sheldrick, G. M. A Short History of SHELX. Acta Cryst. 2008, A64, 112–122. DOI:10.1107/S0108767307043930. (c) Sheldrick, G. M. Crystal Structure Refinement with SHELXL. Acta Cryst. 2015, C71, 3–8. DOI: 10.1107/S2053229614024218. (d) Lübben, J.; Wandtke, C. M.;Hübschle, C. B.; Ruf, M.; Sheldrick, G. M.; Dittrich, B. Aspherical scatteringfactors for SHELXL – model,implementation and application. ActaCryst. 2019, A75, 50–62. DOI:10.1107/S2053273318013840. 声明:本文仅代表个人观点,笔者学识有限,资料整理过程中可能存在疏漏错误,请不吝指正。
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